响应中是否显示错误代码2?

Do you get an error code of 2 in the response?

这似乎是Google Play服务问题，并且由于没有网络，因此Google Play客户端应用无法同步.当网络可用并且发生同步(几个小时后)后，您就可以再次购买该产品.

It looks like an issue of Google Play services and the Google Play client app getting out of sync because of no network. When the network is available and the sync happens (in a few hours time), you'll be able to buy the product again.